EXPORTED_SYMBOLS = ["MD5"];

const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;
const Cu = Components.utils;

/*
 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
 * Digest Algorithm, as defined in RFC 1321.
 * Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for more info.
 */

/*
 * Configurable variables. You may need to tweak these to be compatible with
 * the server-side, but the defaults work in most cases.
 */

/*
 * These are the functions you'll usually want to call
 * They take string arguments and return either hex or base-64 encoded strings
 */

var MD5 =
{
	hexcase: 	0,   /* hex output format. 0 - lowercase; 1 - uppercase        */
	bpad:		"", /* base-64 pad character. "=" for strict RFC compliance   */

	hex_md5_binary: function(binl, length) { return this.rstr2hex( this.binl_md5(binl,length)); },
	hex_md5: function(s)    { return this.rstr2hex( this.rstr_md5(this.str2rstr_utf8(s))); },
	b64_md5: function(s)    { return this.rstr2b64(this.rstr_md5(this.str2rstr_utf8(s))); },
	any_md5: function(s, e) { return this.rstr2any( this.rstr_md5( this.str2rstr_utf8(s)), e); },
	hex_hmac_md5: function(k, d)
		{ return this.rstr2hex( this.rstr_hmac_md5( this.str2rstr_utf8(k), this.str2rstr_utf8(d))); },
	b64_hmac_md5: function(k, d)
		{ return this.rstr2b64( this.rstr_hmac_md5( this.str2rstr_utf8(k), this.str2rstr_utf8(d))); },
	any_hmac_md5: function(k, d, e)
		{ return this.rstr2any( this.rstr_hmac_md5( this.str2rstr_utf8(k), this.str2rstr_utf8(d)), e); },


	/*
	 * Perform a simple self-test to see if the VM is working
	 */
	md5_vm_test: function()
	{
	  return this.hex_md5("abc").toLowerCase() == "900150983cd24fb0d6963f7d28e17f72";
	},

	/*
	 * Calculate the MD5 of a raw string
	 */
	rstr_md5: function(s)
	{
	  return this.binl2rstr( this.binl_md5( this.rstr2binl(s), s.length * 8));
	},

	/*
	 * Calculate the HMAC-MD5, of a key and some data (raw strings)
	 */
	rstr_hmac_md5: function(key, data)
	{
	  var bkey = this.rstr2binl(key);
	  if(bkey.length > 16) bkey = this.binl_md5(bkey, key.length * 8);

	  var ipad = Array(16), opad = Array(16);
	  for(var i = 0; i < 16; i++)
	  {
		ipad[i] = bkey[i] ^ 0x36363636;
		opad[i] = bkey[i] ^ 0x5C5C5C5C;
	  }

	  var hash = this.binl_md5(ipad.concat( this.rstr2binl(data)), 512 + data.length * 8);
	  return this.binl2rstr( this.binl_md5(opad.concat(hash), 512 + 128));
	},

	/*
	 * Convert a raw string to a hex string
	 */
	rstr2hex: function(input)
	{
	  try { this.hexcase } catch(e) { this.hexcase=0; }
	  var hex_tab = this.hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
	  var output = "";
	  var x;
	  for(var i = 0; i < input.length; i++)
	  {
		x = input.charCodeAt(i);
		output += hex_tab.charAt((x >>> 4) & 0x0F)
			   +  hex_tab.charAt( x        & 0x0F);
	  }
	  return output;
	},

	/*
	 * Convert a raw string to a base-64 string
	 */
	rstr2b64: function(input)
	{
	  try { this.b64pad } catch(e) { this.b64pad=''; }
	  var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	  var output = "";
	  var len = input.length;
	  for(var i = 0; i < len; i += 3)
	  {
		var triplet = (input.charCodeAt(i) << 16)
					| (i + 1 < len ? input.charCodeAt(i+1) << 8 : 0)
					| (i + 2 < len ? input.charCodeAt(i+2)      : 0);
		for(var j = 0; j < 4; j++)
		{
		  if(i * 8 + j * 6 > input.length * 8) output += this.b64pad;
		  else output += tab.charAt((triplet >>> 6*(3-j)) & 0x3F);
		}
	  }
	  return output;
	},

	/*
	 * Convert a raw string to an arbitrary string encoding
	 */
	rstr2any: function(input, encoding)
	{
	  var divisor = encoding.length;
	  var i, j, q, x, quotient;

	  /* Convert to an array of 16-bit big-endian values, forming the dividend */
	  var dividend = Array(Math.ceil(input.length / 2));
	  for(i = 0; i < dividend.length; i++)
	  {
		dividend[i] = (input.charCodeAt(i * 2) << 8) | input.charCodeAt(i * 2 + 1);
	  }

	  /*
	   * Repeatedly perform a long division. The binary array forms the dividend,
	   * the length of the encoding is the divisor. Once computed, the quotient
	   * forms the dividend for the next step. All remainders are stored for later
	   * use.
	   */
	  var full_length = Math.ceil(input.length * 8 /
										(Math.log(encoding.length) / Math.log(2)));
	  var remainders = Array(full_length);
	  for(j = 0; j < full_length; j++)
	  {
		quotient = Array();
		x = 0;
		for(i = 0; i < dividend.length; i++)
		{
		  x = (x << 16) + dividend[i];
		  q = Math.floor(x / divisor);
		  x -= q * divisor;
		  if(quotient.length > 0 || q > 0)
			quotient[quotient.length] = q;
		}
		remainders[j] = x;
		dividend = quotient;
	  }

	  /* Convert the remainders to the output string */
	  var output = "";
	  for(i = remainders.length - 1; i >= 0; i--)
		output += encoding.charAt(remainders[i]);

	  return output;
	},

	/*
	 * Encode a string as utf-8.
	 * For efficiency, this assumes the input is valid utf-16.
	 */
	str2rstr_utf8: function(input)
	{
	  var output = "";
	  var i = -1;
	  var x, y;

	  while(++i < input.length)
	  {
		/* Decode utf-16 surrogate pairs */
		x = input.charCodeAt(i);
		y = i + 1 < input.length ? input.charCodeAt(i + 1) : 0;
		if(0xD800 <= x && x <= 0xDBFF && 0xDC00 <= y && y <= 0xDFFF)
		{
		  x = 0x10000 + ((x & 0x03FF) << 10) + (y & 0x03FF);
		  i++;
		}

		/* Encode output as utf-8 */
		if(x <= 0x7F)
		  output += String.fromCharCode(x);
		else if(x <= 0x7FF)
		  output += String.fromCharCode(0xC0 | ((x >>> 6 ) & 0x1F),
										0x80 | ( x         & 0x3F));
		else if(x <= 0xFFFF)
		  output += String.fromCharCode(0xE0 | ((x >>> 12) & 0x0F),
										0x80 | ((x >>> 6 ) & 0x3F),
										0x80 | ( x         & 0x3F));
		else if(x <= 0x1FFFFF)
		  output += String.fromCharCode(0xF0 | ((x >>> 18) & 0x07),
										0x80 | ((x >>> 12) & 0x3F),
										0x80 | ((x >>> 6 ) & 0x3F),
										0x80 | ( x         & 0x3F));
	  }
	  return output;
	},

	/*
	 * Encode a string as utf-16
	 */
	str2rstr_utf16le: function(input)
	{
	  var output = "";
	  for(var i = 0; i < input.length; i++)
		output += String.fromCharCode( input.charCodeAt(i)        & 0xFF,
									  (input.charCodeAt(i) >>> 8) & 0xFF);
	  return output;
	},

	str2rstr_utf16be: function(input)
	{
	  var output = "";
	  for(var i = 0; i < input.length; i++)
		output += String.fromCharCode((input.charCodeAt(i) >>> 8) & 0xFF,
									   input.charCodeAt(i)        & 0xFF);
	  return output;
	},

	/*
	 * Convert a raw string to an array of little-endian words
	 * Characters >255 have their high-byte silently ignored.
	 */
	rstr2binl: function(input)
	{
	  var output = Array(input.length >> 2);
	  for(var i = 0; i < output.length; i++)
		output[i] = 0;
	  for(var i = 0; i < input.length * 8; i += 8)
		output[i>>5] |= (input.charCodeAt(i / 8) & 0xFF) << (i%32);
	  return output;
	},

	/*
	 * Convert an array of little-endian words to a string
	 */
	binl2rstr: function(input)
	{
	  var output = "";
	  for(var i = 0; i < input.length * 32; i += 8)
		output += String.fromCharCode((input[i>>5] >>> (i % 32)) & 0xFF);
	  return output;
	},

	/*
	 * Calculate the MD5 of an array of little-endian words, and a bit length.
	 */
	binl_md5: function(x, len)
	{
	  /* append padding */
	  x[len >> 5] |= 0x80 << ((len) % 32);
	  x[(((len + 64) >>> 9) << 4) + 14] = len;

	  var a =  1732584193;
	  var b = -271733879;
	  var c = -1732584194;
	  var d =  271733878;

	  for(var i = 0; i < x.length; i += 16)
	  {
		var olda = a;
		var oldb = b;
		var oldc = c;
		var oldd = d;

		a = this.md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
		d = this.md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
		c = this.md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);
		b = this.md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
		a = this.md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
		d = this.md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);
		c = this.md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
		b = this.md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
		a = this.md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
		d = this.md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
		c = this.md5_ff(c, d, a, b, x[i+10], 17, -42063);
		b = this.md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
		a = this.md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);
		d = this.md5_ff(d, a, b, c, x[i+13], 12, -40341101);
		c = this.md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
		b = this.md5_ff(b, c, d, a, x[i+15], 22,  1236535329);

		a = this.md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
		d = this.md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
		c = this.md5_gg(c, d, a, b, x[i+11], 14,  643717713);
		b = this.md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
		a = this.md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
		d = this.md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);
		c = this.md5_gg(c, d, a, b, x[i+15], 14, -660478335);
		b = this.md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
		a = this.md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
		d = this.md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
		c = this.md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
		b = this.md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);
		a = this.md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
		d = this.md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
		c = this.md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);
		b = this.md5_gg(b, c, d, a, x[i+12], 20, -1926607734);

		a = this.md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
		d = this.md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
		c = this.md5_hh(c, d, a, b, x[i+11], 16,  1839030562);
		b = this.md5_hh(b, c, d, a, x[i+14], 23, -35309556);
		a = this.md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
		d = this.md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);
		c = this.md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
		b = this.md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
		a = this.md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);
		d = this.md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
		c = this.md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
		b = this.md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);
		a = this.md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
		d = this.md5_hh(d, a, b, c, x[i+12], 11, -421815835);
		c = this.md5_hh(c, d, a, b, x[i+15], 16,  530742520);
		b = this.md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);

		a = this.md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
		d = this.md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);
		c = this.md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
		b = this.md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
		a = this.md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);
		d = this.md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
		c = this.md5_ii(c, d, a, b, x[i+10], 15, -1051523);
		b = this.md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
		a = this.md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
		d = this.md5_ii(d, a, b, c, x[i+15], 10, -30611744);
		c = this.md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
		b = this.md5_ii(b, c, d, a, x[i+13], 21,  1309151649);
		a = this.md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
		d = this.md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
		c = this.md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);
		b = this.md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);

		a = this.safe_add(a, olda);
		b = this.safe_add(b, oldb);
		c = this.safe_add(c, oldc);
		d = this.safe_add(d, oldd);
	  }
	  return Array(a, b, c, d);
	},

	/*
	 * These functions implement the four basic operations the algorithm uses.
	 */
	md5_cmn: function(q, a, b, x, s, t)
	{
	  return this.safe_add( this.bit_rol( this.safe_add( this.safe_add(a, q), this.safe_add(x, t)), s),b);
	},
	md5_ff: function(a, b, c, d, x, s, t)
	{
	  return this.md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
	},
	md5_gg: function(a, b, c, d, x, s, t)
	{
	  return this.md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
	},
	md5_hh: function(a, b, c, d, x, s, t)
	{
	  return this.md5_cmn(b ^ c ^ d, a, b, x, s, t);
	},
	md5_ii: function(a, b, c, d, x, s, t)
	{
	  return this.md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
	},

	/*
	 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
	 * to work around bugs in some JS interpreters.
	 */
	safe_add: function(x, y)
	{
	  var lsw = (x & 0xFFFF) + (y & 0xFFFF);
	  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
	  return (msw << 16) | (lsw & 0xFFFF);
	},

	/*
	 * Bitwise rotate a 32-bit number to the left.
	 */
	bit_rol: function(num, cnt)
	{
	  return (num << cnt) | (num >>> (32 - cnt));
	},
}
